Time-Resolved Photoluminescence Lifetime Measurements of the Gamma(5) and Gamma(6) Free Excitons in ZnO
- Reynolds, D. C.
- Look, David C.
- Jogai, B.
- Hoelscher, J. E.
- Sherriff, R. E.
- Harris, M. T.
- Callahan, M. J.
DOIAbstract
Time-resolved photoluminescence spectroscopy at 2 K was used to measure the radiative recombination lifetime of the allowed (Γ5) and forbidden (Γ6) free excitons in ZnO. The measurements were made on a sample containing internal strain, which altered the sample symmetry, and resulted in relaxed selection rules, allowing the Γ6 exciton to be observed. A radiative recombination lifetime of 259 ps was measured for the Γ5 exciton and 245 ps for the Γ6 exciton. The decay of the free excitons was of single-exponential form, and the decay times were obtained using a least-squares fit of the data
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